Xari Arena 9/20/83

This is the final version. It not only adds Trak-Ball
support but fixes a serious bug where a Xari can get trapped in
the center well and cannot be killed. Interestingly this
version also removes the ending message telling the player to
contact John at Atari after beating the game. Perhaps Atari
didn't want people pestering its programmers? In its place
is a randomization code that kicks in, taking the player to a
random level.

This version was never burned onto EPROMs but rather had to be
extracted from the programmers own disk.